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  1. Nerf Bars - Running Boards
  2. Westin
  3. Nerf Bars
  4. Fixed Step
  5. 4 Inch Width
  6. Black
Westin PRO TRAXX Oval Nerf Bars - 4" - Black Powder Coated Steel

Westin PRO TRAXX Oval Nerf Bars - 4" - Black Powder Coated Steel

Item # 21-23715
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Nerf Bars - Running Boards

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Westin Fixed Step Nerf Bars - Running Boards - 21-23715
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The curved ends on these rust-resistant black powder coated steel steps give your vehicle a streamlined look. Fully enclosed ends prevent internal corrosion. Top-mounted, non-slip pads provide sure footing and rugged style. Fastest Shipping and Guaranteed Lowest Prices for Westin PRO TRAXX Oval Nerf Bars - 4" - Black Powder Coated Steel. Read our customer reviews of Westin nerf bars - running boards. Call 800-298-1624 for expert service or order your nerf bars - running boards part number 21-23715 by Westin online at
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  • Reviews (167)
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Westin Nerf Bars - Running Boards - 21-23715

  • Nerf Bars
  • Fixed Step
  • 4 Inch Width
  • Black
  • Westin
  • Steel
  • Cab Length
  • Gloss Finish
  • Oval

The curved ends on these rust-resistant black powder coated steel steps give your vehicle a streamlined look. Fully enclosed ends prevent internal corrosion. Top-mounted, non-slip pads provide sure footing and rugged style.


  • Custom-fit, cab-length, oval nerf bars make it easy to get into and out of your vehicle
    • Greater stability than narrower round bars
  • Seamless, domed ends with 30-degree bends deliver a finished, street-style look
    • Fully sealed ends keep out moisture
  • Wide, saddle-pad step areas provide sure footing
    • Raised tread makes it easy for shoes to grip the surface
    • Sturdy polymer plastic resists UV rays, fading, and cracking
  • Mild steel with black powder coat finish resists rust
  • Quick and easy bolt-on installation with included hardware
    • No drilling required


  • Tubing width: 4"
  • Step pad width: 4"
  • Step pad quantity: 2 per bar
  • Quantity: 2 nerf bars
  • 3-Year warranty

Domed ends of black bar

The PRO TRAXX oval step bars from Westin offer the best in both durability and rugged style. Sturdy, black powder coated steel construction and sealed, domed ends work together to prevent internal corrosion. Top-mounted, saddle-pad-style step pads have raised tread for excellent grip and deep grooves that allow water to quickly and easily drain away.

21-23715 Westin Mild Steel Oval Tube Steps with Wide Steps - ProTraxx Series - Black - 4" Wide

Installation Details 21-23715 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Video of Westin PRO TRAXX Oval Nerf Bars - 4" - Black Powder Coated Steel

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Westin PRO TRAXX Oval Nerf Bars Review

What's up everybody Adam, here with etrailer. Today we are gonna be taking a look at the Westin Pro Traxx Nerf Bars. With the Western Pro Traxx we're gonna have some options. Well, one, you can have the black powder coated finish, which I like that, but you can also get silver as well. That just all comes down to the look you're really going for on your vehicle and we also have some other options. So the ones you see right here are the cab length Nerf Bars, but we can also get some that'll be wheel to wheel.

So it'll be a little bit longer. So we'll have an extra third step right here. So if you do have a toolbox or you just tend to get stuff out of your truck and you need a little bit more lift to get up in there, you can get the wheel to wheels as well. There's also gonna be some width options. So, the ones we have right now are four inches wide.

When I mean four inches is just the width of our little step pad here. But you can also get a five inch wide pad. So if you want more surface area to step on, just so it's a little easier for you, we have those options. One thing I like about these is the oval shape. Some of the round Nerf Bars, I just don't like the looks of them.

It doesn't really fill up this whole entire area. And even with the smaller steps, meaning the four inch wide steps, it does kind of cover all this up, so it seems full. You know what I'm talking about, whenever you see running boards on a truck or whatever, and it just seems like there's just a lot of gap there. With this it just fills it up so it seems kind of like factory, like it's supposed to be there. It's not just some cheap bolt on accessory.

So this is gonna be an upgrade from some of the entry level type, three inch wide Nerf Bars. It's also going to be an upgrade from some of the hoop steps, just because it adds a little bit more of a look. I don't necessarily love the hoop steps, just because, again, it just doesn't seem full. I like the looks of the vehicle and that's half of the reason why I grabbed running boards. Yes, it's nice to have a step, but looks is a big thing. When it comes to looks I did notice, on these we actually have this little bracket that is going to cover up the metal bracket underneath. So that's kinda how it mounts to the underneath of your vehicle. But I like how they threw these in, just because again, it looks more full and it looks really neat. This is definitely the middle of the road running board. It's an upgrade from the lower ones. But if you we're to upgrade from these, if you're looking at some of the more premium options that you have, there's a couple of things you can do. If you really want to grab the more premium option that just gives you more of a step, the Westin Grate Steps have a six and a half inch wide steps. So if you're looking for something like that, that's probably gonna be a good upgrade for you. And it also has a lot more traction, 'cause it's all metal. If you don't really like the plastic pads, even though they're not gonna fade or crack over time, it would be an upgrade that way. Another one, you can get some motorized steps, which those are super fancy and fun, but I don't necessarily think that they're necessary for this truck. That's just me, but just know you do have some options for upgrades from the Pro Traxx, but you also have some low tier ones as well on our website. We have a lot, and a lot of you guys are wondering if it's gonna fit your vehicle, so be sure to use our fit guide. We have all that data in there, so once you put your vehicle in, it'll connect it to the right kit. I really like how long the step is. So on these right here, it's about 23 and a half inches long, which is plenty long for me. So I have a perfect spot to put my foot just getting in, just like this, which I like, but also whenever I'm just kind of hanging out, sometimes I actually put my feet up here to look up, especially when I'm kinda driving trails and stuff. It's right there and I have plenty of pads. I'm not just stepping on the bare metal, so I'll have plenty of grip. I have a roof rack on my vehicle and I use my running boards to be able to put accessories and stuff up there. Whether I'm putting, loading up my gear or just adding an accessory. It's super nice to be able to kinda come up. It's not wide enough to where I can kinda stay without having to hold myself up. Like I can lean over and do what I need to do. But again, if you really want to be able to just have majority of your feet on the running boards, whenever you're loading stuff up, you probably want to go with the five inch wide. And if you really want a lot, then go with the six and a half, but this is plenty good. I'm kind of on the balls of my feet, but I can still balance up here and load stuff up. But as I start to lean back, it gets a little bit more difficult. With the four inch wide steps if I measure from our rocker panel right here, it's about three and a half inches out. So we don't get four inches from the very, very side, which I don't mind that at all. I really like when the running boards are really close to the vehicle, but then when you get the five inch steps, the point at which the inside of the rail's gonna stay the same, it's just gonna get a little bit wider and stick out a little farther. We're actually still a couple of inches inside where our wheels sit and these are stock factory wheels. This isn't really gonna limit your truck at all. So it's gonna enable it to do more. Another thing that I would, I like to do in my trucks is put a mud flap right here, just to keep the running boards nice and clean. But another thing that I noticed about these, a lot of the end caps are plastic. And usually they keep a lot of that rust or the water out so it prevents against rust, but this is all metal. It's just one big piece, so it's not a cap. So there's nothing really to replace there. And there's definitely not any water getting in there, of course. A benefit to having the Nerf Bars being pretty close to the truck is the flex. So with the three inch Nerf Bars, some of them, they kind of stick out a lot and as you can see, I'm moving the truck and they're probably a little bit of flex there, but you can't really feel it. On my factory ones on my old car there's a lot of flex to them and I hate that. So with these, I really like how stable and solid they are, because whenever I step on something I just want it to be nice and solid. And the OEM ones that I have on my vehicle actually flex more than these. So that is definitely an upgrade. And another thing about the grip, this isn't gonna be as much grip as some of the Westin Grate Steps, just because that's literally just metal punched through. So that's gonna be extremely grippy, but this does have plenty of grip. So even if you have snow on your shoes, mud on your shoes, we do have some raised edges here and these aren't really gonna wear down, 'cause it is a nice, hard plastic. And then it's not gonna fade away or anything like that either. So, I like that. I'm definitely a fan of these. The whole point of Nerf Bars is just to help you and your passengers get in and maybe even just load some other stuff up on top of the roof, just so you don't have to step on the inside of the vehicle. You just want to keep it all nice and clean, but also, it's about the looks. And with me, I think it checks that box. I like the looks of it. I also like the options, so that is another box that it checks. I just really like where you have options, where the width, wheel to wheel, color options. And then of course it's just a solid, solid step. And that'll do it for a look at the Westin Pro Traxx Nerf Bars..

Customer Reviews

Westin PRO TRAXX Oval Nerf Bars - 4" - Black Powder Coated Steel - 21-23715

Average Customer Rating:  4.7 out of 5 stars   (166 Customer Reviews)

The curved ends on these rust-resistant black powder coated steel steps give your vehicle a streamlined look. Fully enclosed ends prevent internal corrosion. Top-mounted, non-slip pads provide sure footing and rugged style.

- 21-23715

they installed as simply and accurately as stated. I would recommend the kit that installs directly to avoid any drilling. I haven't slip once stepping up and find it very helpful getting into the truck.

they function as good as the first day they were installed.
William - 12/06/2019

- 21-23715

I love the super fast and free shipping from etrailer. Already referred them to a couple of work friends that are looking for accessories. As for the nerf bars, not exactly the quality that I would have hoped for but, comparing price/quality, I have to go with 5 stars. I could have spent a lot more. They look great on the truck and only time will tell how they hold up. Westin has never failed me and neither has etrailer.

- 21-23715

Excellent product and awesome service! The Westin nerf bars are simple to install and make getting in and out of the vehicle safer for my family.

- 21-23715

Overall, I have been pleased with the running boards, BUT as I washed the truck yesterday, I noticed that the right side tube is starting to rust in two places already. That should not be happening after just one year.

- 21-23715
2019 Chevrolet Silverado 1500 LD

Exact fit, arrived in excellent condition. The installation was easy, no guesswork regarding the instructions.

- 21-23715

Perfect fit!

- 21-23715

One year later still looking good no issue with install

Easy t - 06/22/2020

- 21-23715

Perfect fit! Looks great!! Thank you

- 21-23715

Fit perfect. Easy to install. Looks great and enhances truck look.

- 21-23715

- 21-23715
2015 GMC Sierra 2500

- W42UR

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

Ordered the nerf bars for my ram truck and received it when promised. Instruction is easy to follow and installation had no issues or problem. I really like the look of these nerf bars on my truck. Easy to order, timely delivery, great product with very good instructions and easy installation. Will order more accessories from this vendor.

- WE99FR

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

Great product. Only complaint is I own a 2020 Ram 3500 LoneStar. The rear brackets fit perfectly but the trucks mounting location was different from diagram. There is no opening to fish the brackets which came with bed connecting piece. Modification took about 30 minutes but done. The directions could be clearer for sure but as for etrailer and product itself great.

- 21-23945

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

These nerf bars are great! They are very well constructed, are easy to install, and look good. The fit my 2020 F-350 perfectly. They also are a great price. I went with the matte black finish and it looks great. I like the fact that the ends of the bars welded shut unlike other bars I have had which typically have had a plastic cap over the end. The plastic cap will eventually leak and the bars rust from the inside out. These bars do ride a bit higher than my old OEM Ford nerf bars did. This gives improves the look but creates a higher step. The one thing I would suggest to the manufacturer is to supply a few extra spacer washer in the kit for the purpose of leveling it out visually.

- 21-24015

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

Great nerfs! Easy install and they look fine on my 19 Colorado. The price was right and etrailer under-promised and over delivers with fantastic shipping! I am 73 years old and had them install with no hoist in an hour and a half. Simple tools and follow the directions for a great install.

Great! I love them!
David - 08/31/2020

- 21-63565

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

These are well built and add a great look to my 2019 Dodge dually. Holding up well with powder coat and looks as good as the day I installed them. Not too difficult to install once you figure it out. Very reasonable price and quick delivery from e-trailer

Holding up well but powder coat is peeling in a couple places. Not happy about that
Dave - 01/11/2022

I recommend touching up the powder coated areas that are peeling with a rust resistant paint to help protect against rust. You can kind a rust resistant paint in a glossy finish if you prefer.

-- Etrailer Expert Jenny N - 1/12/2022

- 21-23555

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

The nerf bars I purchased a year ago have held up wonderfully. They have no rust and the color is still fantastic. They were a great addition to my truck. They changed the look of my stock 2019 Ram 1500 completely.

Fantastic. Still like new. no looseness or rust of any kind. Great product.
Terry E - 03/27/2021

- 21-23295

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

Installed one year ago on my 2015 Jeep Rubicon Wrangler Unlimited. Installation was simple, with the exception of one thing. To install the step you must permanently remove the "rock sliders" with leaves the bottom seam of the body exposed. The steps still look in newish condition, except for the color (now dark gray) which has caught up with all the black plastic on my Jeep, thanks to the AZ sun. The rubber tread can be slick when wet.

Still good, no change, no problems! Now in S Florida.
Gelatoman - 06/08/2020

- 21-23710

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

These are a very sturdy, good quality product! I would like to see the placement of the black step portion changed. It needs to be moved back a little for the driver and front passenger. The black portion is too far forward, so when swinging out of the cab to step down, the left foot for the driver, and right foot for the passenger, hits at the back edge of the step. My husband actually hits behind the black step portion when getting out of my truck, scratching the stainless steel bars with his shoes or boots. I can't comment on the placement of the black portion for the back seat passengers, as I have not sat back there since putting the bars on.

As I stated in my original review, the rubber steps are too far forward on the bars. When swinging your feet out of the truck to step down, they hit just behind, or at the back edge of the rubber, causing the bars to get scratched up. I can’t say for the back door steps, but the front door steps need to be back at least 6” to put them in just the right place.
Vicky - 05/06/2021

- 21-24005

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

I am very pleased with the running boards themselves. However the carton they arrived in was very badly torn on both ends and one of the boards has the paint damaged to the point where the bare metal is exposed. Also one set of fasteners was missing . Please send one set of fasteners and if there is a touch up paint available that would also be appreciated.

Customer Service is reaching out to you.
-- Etrailer Expert Sierra K - 12/13/2021

- 21-23565

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

Looks good hopefully last long time. I like the fact that they fit closer to the cab over my old boards

Great product works very well i think they look better than the mopar ones because the ends turn in
John G - 02/06/2021

- 21-24130

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

Perfect fit. Instructions very well written. Installed by myself in a little over an hour.

- 21-54130

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

I would have given 5 stars except for the bolt heads supplied. I think they look great on my 2021 Silverado LT. It will definitely assist my wife and mother in getting in to the truck. I just wished the bolt heads that attached the brackets to the nerf bars had a different head as I ended up stripping the cheap allen heads on two of them. Removing them and replacing them will be painful.

- 21-23945

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

I am very happy with the nerf bars. The package was missing 2 lock washers but I had some that fit so it was not a huge issue. Installation was easy. I installed them in a couple of hours. They look great on my truck and make it much easier for my family to climb in and out. I have purchased other products from etrailer (a bike rack and a hitch basket) and they were fantastic also. In my opinion this is a good company with good products and service.

- 21-24015

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

Pro Traxx 4 in. Nerf step bars easy installation 2 1/2 hours not bad time for someone that’s 77 years old they work good and look good.

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Info for this part was:

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Edited by:
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Employee Randy B
Installed by:
Randy B
Employee Chris R
Video Edited:
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Written by:
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Video by:
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